Electrical study of cathodic activation and relaxation of La<sub>0,80</sub>Sr<sub>0,20</sub>MnO<sub>3</sub> - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Ionics Année : 2009

Electrical study of cathodic activation and relaxation of La0,80Sr0,20MnO3

Résumé

The effect of cathodic activation of sprayed La0.8Sr0.2MnO3 (LSM) films has been studied by electrochemical spectroscopy impedance (EIS). LSM powder was prepared by a citrate route and X-ray diffraction analyses show a complete LSM crystallization without La2O3 or La(OH)3 as side products. Porosity and grain size estimated from scanning electronic microscopy gave values of 33% and 100 nm, respectively. EIS measurement was performed on a Pt/yttria-stabilized zirconia/LSM cell before and after a cathodic current load (300 mA/cm2) on LSM electrode. The relaxation process, which is time-dependent, has been investigated. A drastic decrease of the electrode resistance was noticed just after applying the cathodic current, but after 9 h at optimized valence configuration in air at 850 °C, the recorded polarization resistance gradually enhanced until it almost reached the initial value. The resulting diagrams have been fitted using a Gerischer associated with a resistor and constant phase elements. This simple method has permitted us to observe that only the electrode interfaces are modified by a cathodic activation and the microstructure remains nearly constant.

Dates et versions

hal-00384864 , version 1 (16-05-2009)

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Rose-Marie Belardi, Jonathan Deseure, Márcia Caldeira Brant, Tullio Matencio, Rosanna Zacarias Domingues. Electrical study of cathodic activation and relaxation of La0,80Sr0,20MnO3. Ionics, 2009, 15 (2), pp. 227-232. ⟨10.1007/s11581-008-0264-6⟩. ⟨hal-00384864⟩
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